Heat exchanger inlet chamber

FIELD: heat-power engineering; power engineering; chemical and oil industries.

SUBSTANCE: proposed chamber is provided with rods having section in form of rectangle; rods are mounted over entire perimeter of tube bank in parallel with tubes; vertices of adjacent faces directed towards each other form diffuser and contraction passages. Vertices of faces of adjacent rods directed towards each other may be rounded-off.

EFFECT: reduced hydraulic resistance and enhanced reliability.

2 cl, 3 dwg

 

The invention relates to a power system, in particular the heat-exchange apparatus, and can be used in power, chemical and oil industry.

Known input chamber of the heat exchanger containing a tube bundle placed in the enclosure, the inlet nozzle tube environment and the distribution screen, made in the form of irregularly perforated septum covering the tube bundle /1/.

A disadvantage of the known input camera is the presence of strongly turbulizing flow tube environment at its exit from the hole wall in beam pipe, which creates the risk of vibration damage to the peripheral tubes and, consequently, reduces the reliability of the heat exchanger.

In addition, the distribution screen has a higher hydraulic resistance and time-consuming to manufacture.

Closest to the invention to the technical essence and the achieved result is the input chamber of the heat exchanger, in which the inside within the transverse dimension of the beam, posted by a system of rods, arranged by vertices of isosceles triangles, the area of the pipes entering and fixed outside /2/.

A disadvantage of the known construction is that the rods are not located around the perimeter of the tube bundle, but only in the AOR is e inlet, consequently the peripheral tubes of the tube bundle outside of the nozzle, is not protected from the direct effects of turbulent flows, rolling them, which leads to increased vibration of the peripheral tubes of the tube bundle and, therefore, reduce its reliability.

The technical result of the invention is that the reduced hydraulic resistance and increases the reliability of the entrance chamber of the heat exchanger.

The input chamber of the heat exchanger includes a housing covering the tube bundle and provided with a pipe entering the outside environment, and the screen in the form of a set of rods placed between the shell and tube bundle to form between adjacent bars diffusore-confused channels for the passage of the outside environment, and the specified technical result is achieved by the fact that the rods are made with a cross section in the form of a rectangle, installed around the perimeter of the beam parallel to the tubes and the adjacent aimed vertices faces towards each other with the formation of the above-mentioned channels, which is the essence of the invention.

A version of the execution chamber, in which the top faces of adjacent rods located towards each other, made rounded.

1 shows a longitudinal section of the entrance chamber of the heat exchanger;

figure 2 - shows a section a-a in figure 1;/p>

figure 3 - shows the extension element B in figure 2.

The input chamber of the heat exchanger includes a housing 1 with a pipe input 2 shell environment. The housing 1 encloses the tube bundle 3, consisting of the pipes 4, screen 5, is made in the form of a set of rods 6 with a cross section in the form of a rectangle, installed around the perimeter of the beam 3, parallel to the pipe 4, and the adjacent aimed peaks 7 of their faces towards each other and form diffusore-confused channels 8. The rods 6 with their ends connected to the ring 9 by means of welds 10. The rods 6 for rigidity interconnected bridges 11 by means of welds 12.

When the heat exchanger tube environment through pipe input 2 goes into the inside of the housing 1 and passing through diffusore-confused channels 8 formed by the tops 7 of the faces of the rods 6 screen 5, is evenly distributed around the perimeter and the cross-section of the tube bundle 3, and the stream tube environment loses part of its kinetic energy (diffusore-confused effect), the speed of the outside environment is reduced, and it also reduces the shock load on the peripheral rows of tubes 4 beam 3 and, accordingly, vibration and abrasion of the pipe wall of the spacer elements (not shown) of the tube bundle 3, which increases the reliability of the beam.

To reduce the hydraulic resistance of the screen is 5 provides for the rounding of the peaks 7 of the rod 6 small radius, for example 2-4 mm, to avoid sharp edges at the vertex 7, which increases the hydraulic resistance diffusore-confused channel 8.

Sources of information

1. U.S. patent No. 2655350, CL 165-160, 1953 - equivalent.

2. USSR author's certificate No. 1268927, F 28 D 7/00, 1984 prototype.

1. The input chamber of the heat exchanger, comprising a housing covering the tube bundle and provided with a pipe entering the outside environment, and the screen in the form of a set of rods placed between the shell and tube bundle to form between adjacent bars diffusore-confused channels for the passage of the tube environment, characterized in that, to reduce the hydraulic resistance and improve reliability, the rods are made with a cross section in the form of a rectangle, installed around the perimeter of the beam parallel to the tubes and the adjacent aimed vertices faces towards each other with the formation of the above-mentioned channels.

2. The camera according to claim 1, characterized in that the top faces of adjacent rods located towards each other, made rounded.



 

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